<template>
  <div class="goods">
    <div class="menu-wrapper" ref="menuWrapper">
      <ul>
        <li v-for="(item,index) in goods" :key="index" class="menu-item"
            :class="{'current':currentIndex===index}" @click="selectMenu(index,$event)">
          <span class="text border-1px">
            <span v-show="item.type>0" class="icon" :class="classMap[item.type]"></span>{{item.name}}
          </span>
        </li>
      </ul>
    </div>
    <div class="foods-wrapper"  ref="foodsWrapper">
      <ul>
        <li v-for="(item,index) in goods" :key="index" class="food-lise food-list-hook">
          <h1 class="title">{{item.name}}</h1>
          <ul>
            <li v-for="(food,index) in item.foods" :key="index" class="food-item border-1px" @click="selectFood(food,$event)">
              <div class="icon">
                <img width="57" height="57" :src="food.icon" alt="">
              </div>
              <div class="content">
                <h2 class="name">{{food.name}}</h2>
                <p class="desc">{{food.description}}</p>
                <div class="extra">
                  <span class="count">月售{{food.sellCount}}份</span><span>好评率{{food.rating}}%</span>
                </div>
                <div class="price">
                  <span class="now">￥{{food.price}}</span><span class="old" v-show="food.oldPrice">￥{{food.oldPrice}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cartcontrol @cart-add="_drop" :food="food"></cartcontrol>
                </div>
              </div>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <ShopCart ref="shopcart" :select-foods="selectFoods" :delivery-price="fruits.deliveryPrice" :min-price="fruits.minPrice"></ShopCart>
    <food @cart-add="_drop" :food="selectedFood" ref="food"></food>
  </div>
</template>

<script>

import BScroll from 'better-scroll'
import ShopCart from '../shopcart/shopcart'
import cartcontrol from '../cartcontrol/cartcontrol'
import food from '../food/food'

export default{
  data () {
    return {
      goods: [],
      classMap: ['decrease', 'discount', 'special', 'invoice', 'guarantee'],
      listHeight: [],
      scrollY: 0,
      selectedFood: {}
    }
  },
  props: {
    fruits: {
      type: Object
    }
  },
  computed: {
    currentIndex () {
      for (let i = 0; i < this.listHeight.length; i++) {
        let height1 = this.listHeight[i]
        let height2 = this.listHeight[i + 1]
        if (!height2 || (this.scrollY >= height1 && this.scrollY < height2)) {
          return i
        }
      }
      return 0
    },
    selectFoods () {
      let foods = []
      this.goods.forEach((good) => {
        good.foods.forEach((food) => {
          if (food.count) {
            foods.push(food)
          }
        })
      })
      return foods
    }
  },
  created () {
    this.axios.get('/api/goods')
      .then(res => {
        this.goods = res.data.data
        this.$nextTick(() => {
          this._initScroll()
          this._calculateHeight()
        })
      })

    /* this.$on('cart-add', function () {
      console.log(1)
      // this.$refs.shopcart.drop(target)
    }) */
  },
  mounted () {
    this.$on('cart-add', function (target) {
      console.log(1)
      this.$refs.shopcart.drop(target)
    })
  },
  methods: {
    selectMenu (index, event) {
      if (!event._constructed) {
        return
      }
      let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook')
      let el = foodList[index]
      this.foodsScroll.scrollToElement(el, 300)
    },
    selectFood (food, event) {
      if (!event._constructed) {
        return
      }
      this.selectedFood = food
      this.$refs.food.show()
    },
    _drop (target) {
      // 体验优化，异步执行下落动画
      this.$nextTick(() => {
        this.$refs.shopcart.drop(target)
      })
    },
    _initScroll () {
      this.menuScroll = new BScroll(this.$refs.menuWrapper, {
        click: true
      })

      this.foodsScroll = new BScroll(this.$refs.foodsWrapper, {
        click: true,
        probeType: 3
      })

      this.foodsScroll.on('scroll', pos => {
        this.scrollY = Math.abs(Math.round(pos.y))
      })
    },
    _calculateHeight () {
      let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook')
      let height = 0
      this.listHeight.push(height)
      for (let i = 0; i < foodList.length; i++) {
        let item = foodList[i]
        height += item.clientHeight
        this.listHeight.push(height)
      }
    }
  },
  components: {
    ShopCart,
    cartcontrol,
    food
  }
}
</script>

<style scoped lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixin.styl"
  .goods
    display flex
    position absolute
    top 174px
    bottom 46px
    width 100%
    overflow hidden
    .menu-wrapper
      flex 0 0 80px
      width 80px
      background #f3f5f7
      .menu-item
        display table
        width 56px
        height 54px
        padding 0 12px
        line-height 14px
        &.current
          position relative
          z-index 10
          margin-top: -1px
          background #fff
          font-weight 700
          .text
            border-none()
        .ico
          display inline-block
          vertical-align top
          width 12px
          height 12px
          margin-right 2px
          background-size 12px 12px
          background-repeat no-repeat
          &.decrease
            bg-image('decrease_3')
          &.discount
            bg-image('discount_3')
          &.special
            bg-image('special_3')
          &.invoice
            bg-image('invoice_3')
          &.guarantee
            bg-image('guarantee_3')
        .text
          display table-cell
          width 56px
          vertical-align middle
          border-1px(rgba(7,17,27,0.1))
          font-size 12px
    .foods-wrapper
      flex 1
      .title
        padding-left 14px
        height 26px
        line-height 26px
        border-left 2px solid #d9dde1
        font-size 12px
        color rgb(147,153,159)
        background #f3f5f7
      .food-item
        display flex
        margin 18px
        padding-bottom 18px
        border-1px(rgba(7,17,27,0.1))
        &:last-child
          border-none()
          margin-bottom 0
        .icon
          flex 0 0 57px
          margin-right 10px
        .content
          flex 1
          .name
            margin 2px 0 8px 0
            height 14px
            line-height 14px
            font-size 14px
            color rgb(7,17,27)
          .desc, .extra
            line-height 10px
            font-size 10px
            color rgb(147,153,159)
          .desc
            margin-bottom 8px
          .extra
            .count
              margin-right 12px
          .price
            font-weight 700
            line-height 24px
            .now
              margin-right 8px
              font-size 14px
              color rgb(240,20,20)
            .old
              text-decoration line-through
              font-size 10px
              color rgb(147,153,159)
          .cartcontrol-wrapper
            position absolute
            right 0
            bottom 12px
</style>
